Evaporating



(No Model.)

J. STUBBS.

. Evaporating Pan. NQ. 240,621. u Patented April 26,1881.

UNITED STATES PATENT OFFICE.

J OELSTUBBS, OF LON LAKE, rMINNESOTA.

EVVAPORATING-PAN.

SPECIFICATION-formingpart of Letters Patent No. 240,621, dated April 26,1881.

Application filed March 10, 1380. (No model.)

To all whom it may concern:

Beit known that I, JOEL STUBBs, of Long Lake, in the county of Hennepinand State of Minnesota, have made certain Improvements in Evaporating`Fans for Sugar and Sirup Making, of which the following is aspecification. l

This invention relates toevaporating-pans used in the manufacture ofsugar, sirup, &c.; and it consists in a shallow metallic pan hav` ingone end semicircular, and a partition run` ning longitudinally throughthe center nearly to the rounded end, dividing the pan into twocompartments, and an adjustable gate shutting oif a portion ot' onecompartment toform a rfinishing-chamber, as hereinafter set forth.

The invention further consists in extending one `of the longitudinalcompartments beyond the other, `so that the dame and smoke may becarried beyond and around the finishing-chamber and not atl'ect it, ashereinafter set forth The invention further consistsin a partitiondividing the arch of the furnace into two compartments. and providingsaid partition with a series of dampers, so that the direction of theflame and smoke may be controlled to regulate the degree of heat beneaththe different parts of the pan, as hereinafter set forth.

Inorder` that those skilled may know how to make and use my improvedevaporator, I will proceed to describe its construction and operation,referring by letters to the accom-1 panying drawings, in Which 4 Figurel is a plan view of my improved evaporator; Fig. 2, a horizontal sectiontaken at the line y y, Fig. 3; Fig.` 3, a vertical cen-pv trai sectiontaken longitudinally; Fig. 4, a cross-section at am, Fig. 2; Fig. 5, adetail per` spective view of the steam-drum,partly in ver` ticalsection; and Fig. 6, `a detail-,view of the i steam-drum and pipesconnected therewith.

`A is the foundation, andB thesside walls,of the furnace, made of brickin thensual man- The compartment C willl be extended beyond thecompartment C2 at c, and provided with an incline, d, for the receptionof the juice, this extension removing that part of the compartmentbeyond the end of the Iinishingchamber, so that the fire from thefurnacemay be carried around the inishing-chamberand not affect it, ashereinafter set forth.

e is a gate or valve, which shuts off a portion of the rear end of thecompartment (P to form a nishingchamber, C3, as hereinafterexplained.

E is a hollow metallic drum set upon or through a plate restingupon theside walls, B, and partition-wall passing through the arch, from thebottom of which a pipe, F, runs back to the grate G of the furnace. Thisgrate Will be formed of gas-pipe or other tubing, of which the pipe F isan extension, so that when the grate, pipe, and part of the drum arefilled with Water steam will be generated by the heat of the fuel usedin the furnace, and lill the space g above the water in the drum E. (SeeFig. 5.) A

From a point near the top of the drum E a smaller pipe, H', branches,andis connected by a pipe-hinge,h', to a similar pipe, H2, which is rundown into and back and forth along the bottom of the finishing-chamberC3, and thence up again to a second pipe-hinge, h2, exactly op posite toand acting in conjuction with the -rsthinge h', fromiwhich point a thirdpipe, El?, projects downward into a Water-tank, l,

(see Fig.4,) by which the steam is condensed.

. By this means steam is conducted through the nest or coil H2 in thebottomof the finishingchamber to furnish the required heat for iinishingthe sirup by steam, while the hinged joints h hzenablethe coil to beraisedup out of the chamber, 4as shown in Fig. A3, when not in use, orfor cleaning or removing` the pan, or for any other purpose.

Through the center of the flrespace lor arch of the furnace ya brick orother Wall, `K, is form ed, which divides the arch into two longitudinalcompartments, L` L2, corresponding Vwith and directly beneathY the`compartments C G2 and finishing-chamber U3 of the pan.

This Wall K is pierced at i for the passage of rco the smoke and llamefrom the compartment L into the compartment L2, and thence into the flueM, which will be set above and communieating with the rear end of thecompartment L2. This wall K is also pierced at intervals throughout itslength, and provided at these openin gs with dampers m m2 operated byrods n a2 from outside the walls B, and adapted tol reach from thecenter wall to the side walls, as shown in Fig. 2, so that the lire andsmoke may be made to take the course indicated by arrows in Fig. 2 andthus throw all the heat -into one of the longitudinal compartments.

' all points; or if it is desired to produce a greater heat at somepoints than at others it may be accomplished by manipulating thedampers, as will be readily seen.

By closing the damper 'm2 and leaving the damper m as shown in Fig. 2all the flame will be carried through one compartment, L', and intothesmoke-stack M through the ilue i, leaving the finishing-chamber C3entirely unaffected by the direct action of the heat from the furnace,which is a great advantage when it is desired to finish the sirup by theheat of the steam-pipes H2 alone, the compartments G' and L extendingbeyond the finishing-chamber for this purpose.

By increasing the number of the dampers m a still greater variety ofchanges may be given to the draft.

The pan being set about one inch lower at the forward end than at therear end, the juice will flow toward that end, and will become graduallyheated as it approaches the semicircular end b, at which point the`heatis greatest, and will flow around the partition a into thecompartment C2 until stopped by the gate e. When the juice has beenboiled long enough to evaporate that part of it on the semicircle b andin the compartment C2 into a semi-sirup the gate e is opened and thesirup allowed to run into the finishing-chamber =C3 until it is levelwith the remainder of the heat of the steam alone.

v heat.

By my arrangement of the two compartments connected by the semicircle bno square corners are left, in which eddies are formed or dead juiceleft to be injured by the intense The round end also prevents a largeamount of friction, and is a very important feature of my invention.

The upper edges of the sides of the pan and partition a, will beprovided with wooden strips u, Which extend down some distance below theedge of the metal, and 'thus not only act as stift'ening-pieces to thepan, but, wood being a non-conductor of heat, act as coolers to keep thefoam down and prevent its overflowing.

While the juice is iiowing from the incline d to the compartment O2 scumand foam are formed upon its surface, the first or green scum beingcaused by the impurities in the juice; butas the heat increases theseimpurities rise to the surface and form the green scum, and as the juicebecomes purer the foam becomes whiter, so that the operator is able tojudge of the purity of the juice by the appearance of the foam. When thejuice reaches the point b the increased heat raises the foam six oreight inches high, causing a backward movement of the foam toward thethin juice at d, carrying with it the green scum, so that none of thegreen scum passes into the compartment G2 or finishing-chamber C3.

I am aware that it is not new, broadly, to construct evaporating-panswith the border curved at the corners or throughout their extent.

I am also aware that it is not new, broadly, to divide anevaporating-pan by longitudinal or transverse partitions, and do notwish to be understood as claiming any such construction broadly, but

What I claim as new, and desire to secure by Letters Patent, is-

l. The evaporating pan formed into two compartments, C C2, by alongitudinal partition, a., extending not quite to the end, leaving acurved passage, the compartment C2 being divided transversely by a gate,e, to form a tnishingcompartment, G3, and the compartment C extendingbeyond the compartment C3, in combination with the furnace, dividedlongitudinally, as described, and pierced at i, and provided with thedampers M M2, whereby the nishing-chamber may be protected from theiireand smoke, substantially as hereinbefore set forth.

2. Ihe compartments C G2, joined at one end by a curved channel, b, anddivided longitudinally by the partition a, in combination with the gatee, whereby a third compartment is made, as hereinbefore set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOEL S'IUBBS. Witnesses:

C. N. WooDWARD, LoUIs Fnnsnn.

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